Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cda51da05f918ff…

MALICIOUS

PDF

92.0 KB Created: 2021-03-01 03:19:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bad9b08c74e1c3128d6ca88e8ae21a86 SHA-1: 1fc0ec14cc0022a6efd3f95ebe2ccc6dba42ae50 SHA-256: 9cda51da05f918ffd5bff8d5697fec6453f249b4fe58daf2fd0772c84c2df937
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one that appears to be a lure for a manual on creating atheist audiobooks, which redirects to a URL with a 'keyword' parameter. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is part of a link farm on disposable hosting, further supporting a phishing or malware distribution scheme. No scripts were extracted, but the presence of multiple external links points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/wb?keyword=a%20manual%20for%20creating%20atheist%20audiobook PDF link annotation
    • http://testrun.ru/nenunujerere3re3i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455894/normal_601704b774a03.pdfIn PDF document text
    • http://pmaider.com/17697843909b6tvf.pdfIn PDF document text
    • http://maewallace.com/foxukgkf55.pdfIn PDF document text
    • http://vejofewi.iblogger.org/aparato_respiratorio_resumen.pdfIn PDF document text
    • http://menbp.online/android_studio_jdk_7ufa41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421944/normal_5fd2fadb2f436.pdfIn PDF document text
    • http://rexifiru.iblogger.org/dynamic_tension_workout_routine.pdfIn PDF document text
    • http://closemaze.com/guardian_report_your_protection_plan0duaw.pdfIn PDF document text
    • http://pogadai.xyz/animal_planet_go_appbwb1m.pdfIn PDF document text
    • http://youtube-subscribes.com/what_time_is_the_jupiter_saturn_conjunction_2020_pstv35o6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471099/normal_60294d49e7afa.pdfIn PDF document text
    • http://kungfumalibu.com/herman_miller_aeron_chair_size_b_replacement_partsxyiqr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482407/normal_5fca2c3363daa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jidodurej.epizy.com/51797234636.pdfIn PDF document text
    • http://toguxekedufu.epizy.com/jogewoguxexigegebono.pdfIn PDF document text
    • http://nopuxawox.epizy.com/nc_driver_s_permit_test_study_guide.pdfIn PDF document text
    • http://tosopipates.epizy.com/73523306348.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0B 5508 bytes
SHA-256: 463fa6b2d39ff6af13a4f0d3a752e2fc3a75628c779c69921839cba96fa4c61e
font_01_sfnt_off00012e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8F 11312 bytes
SHA-256: 00f193d7286964200fc03a9088f894f9d8e5837109b645127f734217bcc32fb8
font_02_sfnt_off00015459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15459 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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